Kinetic Study of the Corrosion of Co-polyacetal Resin under Nitric Acid Solution

DOI Web Site 27 References
  • Hamamura Takehiro
    Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology R& D Department, Discrete Automation and Motion Division, ABB K.K.
  • Kubouchi Masatoshi
    Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Aoki Saiko
    Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Yoshida Osamu
    R& D Department, Discrete Automation and Motion Division, ABB K.K.
  • Ejima Mitsuhiko
    R& D Department, Discrete Automation and Motion Division, ABB K.K.
  • Sakai Tetsuya
    Department of Industrial Engineering and Management, College of Industrial Technology, Nihon University

Bibliographic Information

Other Title
  • ポリアセタール樹脂の硝酸水溶液環境下における腐食劣化の速度論的研究
  • ポリアセタール ジュシ ノ ショウサン スイヨウエキ カンキョウ カ ニ オケル フショク レッカ ノ ソクドロンテキ ケンキュウ

Search this article

Description

The corrosion mechanism and its modeling of Co-polyacetal (Co-POM) under nitric acid (HNO3) solution were investigated. The degree of degradation was evaluated by the changes in weight and molecular weight. The weight change in HNO3 solution was linearly decreased after the incubation period. From SEC measurements, it was observed that the occurrence of degradation of Co-POM by HNO3 solution was limited near the surface on a specimen, and the inside had remained original material. From this result, it was inferred that the degradation type of Co-POM by HNO3 solution is the corroded layer-forming type. The rate equation for corrosion by hydrolysis reaction between Co-POM and HNO3 solution was proposed with the rate constant for reaction which was calculated from molecular weight change of the surface on a specimen. The diffusion rate of nitric acid concentration was calculated from weight change (Wet–Dry in condition). Finally, the corrosion rate of Co-POM was estimated numerically by combining the concentration of diffused HNO3 solution into Co-POM over time and the previous equation for corrosion. This result of simulation agreed well with the experimental ones.

Journal

  • Corrosion Engineering

    Corrosion Engineering 61 (4), 182-187, 2012

    Japan Society of Corrosion Engineering

References(27)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top